Glossary Of Terms - Ambient Weather WS-0800-IP ObserverBase User Manual

7. Wait about one minute for the ObserverIP module to reboot. You can now Exit the upgrade
window, and access the module again, as referenced in Section 3.7.
You may be required to enter some settings, so check all of the panels for completeness.

5. Glossary of Terms

Term
Absolute Barometric
Pressure
Accuracy
Barometer
Calibration
Dew Point
HectoPascals (hPa)
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Figure 29
Absolute pressure is the measured atmospheric pressure and is a
function of altitude, and to a lesser extent, changes in weather
conditions.
Absolute pressure is not corrected to sea-level conditions. Refer to
Relative Barometric Pressure.
Accuracy is defined as the ability of a measurement to match the actual
value of the quantity being measured.
A barometer is an instrument used to measure atmospheric pressure.
Calibration is a comparison between measurements – one of known
magnitude or correctness of one device (standard) and another
measurement made in as similar a way as possible with a second device
(instrument).
The dew point is the temperature at which a given parcel of humid air
must be cooled, at constant barometric pressure, for water vapor to
condense into water. The condensed water is called dew. The dew point
is a saturation temperature.
The dew point is associated with relative humidity. A high relative
humidity indicates that the dew point is closer to the current air
temperature. Relative humidity of 100% indicates the dew point is equal
to the current temperature and the air is maximally saturated with water.
When the dew point remains constant and temperature increases,
relative humidity will decrease.
Pressure units in SI (international system) units of measurement. Same
Definition
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